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Which of the following best describes an element?
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2. Atoms & Elements
The Atom
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How many oxygen atoms are present in a single molecule of water (H_2O)?
A
0
B
1
C
3
D
2
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Identify the chemical formula of the molecule given, which is H_2O for water.
Understand that the subscript number in a chemical formula indicates the number of atoms of that element in one molecule.
Look at the subscript next to oxygen (O) in H_2O. Since there is no subscript explicitly written after O, it means there is exactly 1 oxygen atom.
Recognize that the subscript 2 after H means there are 2 hydrogen atoms, but this does not affect the count of oxygen atoms.
Conclude that a single molecule of water contains 1 oxygen atom.
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